Javascript Tricks: Getting the full filepath in Mozilla FF and IE.

During our project, I stumbled upon a problem that seemed unsolveable. I was required to get the full path name:

C:\Documents and Settings\Clare\My Documents\test.jpg

My html code was:

<input id="uploadedFile" name="uploadedFile" type="file" onchange="readFile();">
<input type="hidden" value="" id="uploadFileName"/>

My Javascript/Jquery code:

function readFile() {
    var fullPath = $('#uploadedFile').val();   
    if (fullPath != null) {           
        alert(fullPath );
        $('#uploadFileName').val(fullPath ); //Transfer the file path to hidden field
    }

However, this only works with IE. And we mainly use Firefox. 

In firefox,
The output is: test.jpg
 Note: For security reasons, FF prevents the server to access local information.

In IE, 
The output is: C:\Documents and Settings\Clare\My Documents\test.jpg
which is correct.

I have been searching for the solution for almost 8 hours. I have tried using an applet but it didn't work(Probably done it the wrong way). Until I found this 100% working solution:

I forgot the website, but if you are the owner of this code, pls don't hesitate to send me a msg.

Complete html code: 
<input id="uploadedFile" name="uploadedFile" type="file" onchange="readFile(this);">
<input type="hidden" value="" id="uploadFileName"/>

Code: